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CKA study material · question 30 of 1000

A CustomResourceDefinition is installed but nothing happens when its objects are created. What is missing?

  1. A custom controller to act on the objects
  2. An aggregated API server
  3. A ClusterRole binding the CRD to the API server
  4. An admission webhook to validate them
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Answer: A. A custom controller to act on the objects

On its own a custom resource is only structured storage; a controller is what turns it into a working declarative API.

Source: Using RBAC Authorization (Kubernetes) — Aggregated ClusterRoles

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